# DF-1069 source-confirmation

**Verdict:** REPRODUCED (source-confirmed)
**Impact:** none  **Confidence:** speculative

**Kernel ref:** `sys/bus/pci/pci_pci.c:708`

## Mechanism
host_pcib_get_busno missing inner default: Intel 82454NX inner switch(slot) has no default; unexpected slot returns success without writing *busnum -> uninit bus number. malicious PCIe device; confirmed.

## Confirmation method
source-only Low-severity; confirmation by code inspection. Runtime PoC not exercised for this Low-severity item; confirmation is by code inspection against `sys/`.

## Recommended fix
See `fix.diff` in this folder (git-apply-able unified diff).

## Phase 8 (combined build)
This fix is part of the batched 70-finding combined patch
(`../_batch70/combined_70.patch`) applied to in-guest `/usr/src`. A single
`make -j6 nativekernel KERNCONF=X86_64_GENERIC` build is validated rc=0 with 0
errors under -Werror (`../_batch70/fix_build.log`).